gecko-dev/gfx/2d/PathD2D.cpp
2016-02-13 14:33:28 +01:00

485 lines
13 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "PathD2D.h"
#include "HelpersD2D.h"
#include <math.h>
#include "DrawTargetD2D1.h"
#include "Logging.h"
namespace mozilla {
namespace gfx {
// This class exists as a wrapper for ID2D1SimplifiedGeometry sink, it allows
// a geometry to be duplicated into a geometry sink, while removing the final
// figure end and thus allowing a figure that was implicitly closed to be
// continued.
class OpeningGeometrySink : public ID2D1SimplifiedGeometrySink
{
public:
OpeningGeometrySink(ID2D1SimplifiedGeometrySink *aSink)
: mSink(aSink)
, mNeedsFigureEnded(false)
{
}
HRESULT STDMETHODCALLTYPE QueryInterface(const IID &aIID, void **aPtr)
{
if (!aPtr) {
return E_POINTER;
}
if (aIID == IID_IUnknown) {
*aPtr = static_cast<IUnknown*>(this);
return S_OK;
} else if (aIID == IID_ID2D1SimplifiedGeometrySink) {
*aPtr = static_cast<ID2D1SimplifiedGeometrySink*>(this);
return S_OK;
}
return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef()
{
return 1;
}
ULONG STDMETHODCALLTYPE Release()
{
return 1;
}
// We ignore SetFillMode, the copier will decide.
STDMETHOD_(void, SetFillMode)(D2D1_FILL_MODE aMode)
{ EnsureFigureEnded(); return; }
STDMETHOD_(void, BeginFigure)(D2D1_POINT_2F aPoint, D2D1_FIGURE_BEGIN aBegin)
{ EnsureFigureEnded(); return mSink->BeginFigure(aPoint, aBegin); }
STDMETHOD_(void, AddLines)(const D2D1_POINT_2F *aLines, UINT aCount)
{ EnsureFigureEnded(); return mSink->AddLines(aLines, aCount); }
STDMETHOD_(void, AddBeziers)(const D2D1_BEZIER_SEGMENT *aSegments, UINT aCount)
{ EnsureFigureEnded(); return mSink->AddBeziers(aSegments, aCount); }
STDMETHOD(Close)()
{ /* Should never be called! */ return S_OK; }
STDMETHOD_(void, SetSegmentFlags)(D2D1_PATH_SEGMENT aFlags)
{ return mSink->SetSegmentFlags(aFlags); }
// This function is special - it's the reason this class exists.
// It needs to intercept the very last endfigure. So that a user can
// continue writing to this sink as if they never stopped.
STDMETHOD_(void, EndFigure)(D2D1_FIGURE_END aEnd)
{
if (aEnd == D2D1_FIGURE_END_CLOSED) {
return mSink->EndFigure(aEnd);
} else {
mNeedsFigureEnded = true;
}
}
private:
void EnsureFigureEnded()
{
if (mNeedsFigureEnded) {
mSink->EndFigure(D2D1_FIGURE_END_OPEN);
mNeedsFigureEnded = false;
}
}
ID2D1SimplifiedGeometrySink *mSink;
bool mNeedsFigureEnded;
};
class StreamingGeometrySink : public ID2D1SimplifiedGeometrySink
{
public:
StreamingGeometrySink(PathSink *aSink)
: mSink(aSink)
{
}
HRESULT STDMETHODCALLTYPE QueryInterface(const IID &aIID, void **aPtr)
{
if (!aPtr) {
return E_POINTER;
}
if (aIID == IID_IUnknown) {
*aPtr = static_cast<IUnknown*>(this);
return S_OK;
} else if (aIID == IID_ID2D1SimplifiedGeometrySink) {
*aPtr = static_cast<ID2D1SimplifiedGeometrySink*>(this);
return S_OK;
}
return E_NOINTERFACE;
}
ULONG STDMETHODCALLTYPE AddRef()
{
return 1;
}
ULONG STDMETHODCALLTYPE Release()
{
return 1;
}
// We ignore SetFillMode, this depends on the destination sink.
STDMETHOD_(void, SetFillMode)(D2D1_FILL_MODE aMode)
{ return; }
STDMETHOD_(void, BeginFigure)(D2D1_POINT_2F aPoint, D2D1_FIGURE_BEGIN aBegin)
{ mSink->MoveTo(ToPoint(aPoint)); }
STDMETHOD_(void, AddLines)(const D2D1_POINT_2F *aLines, UINT aCount)
{ for (UINT i = 0; i < aCount; i++) { mSink->LineTo(ToPoint(aLines[i])); } }
STDMETHOD_(void, AddBeziers)(const D2D1_BEZIER_SEGMENT *aSegments, UINT aCount)
{
for (UINT i = 0; i < aCount; i++) {
mSink->BezierTo(ToPoint(aSegments[i].point1), ToPoint(aSegments[i].point2), ToPoint(aSegments[i].point3));
}
}
STDMETHOD(Close)()
{ /* Should never be called! */ return S_OK; }
STDMETHOD_(void, SetSegmentFlags)(D2D1_PATH_SEGMENT aFlags)
{ /* Should never be called! */ }
STDMETHOD_(void, EndFigure)(D2D1_FIGURE_END aEnd)
{
if (aEnd == D2D1_FIGURE_END_CLOSED) {
return mSink->Close();
}
}
private:
PathSink *mSink;
};
PathBuilderD2D::~PathBuilderD2D()
{
}
void
PathBuilderD2D::MoveTo(const Point &aPoint)
{
if (mFigureActive) {
mSink->EndFigure(D2D1_FIGURE_END_OPEN);
mFigureActive = false;
}
EnsureActive(aPoint);
mCurrentPoint = aPoint;
}
void
PathBuilderD2D::LineTo(const Point &aPoint)
{
EnsureActive(aPoint);
mSink->AddLine(D2DPoint(aPoint));
mCurrentPoint = aPoint;
}
void
PathBuilderD2D::BezierTo(const Point &aCP1,
const Point &aCP2,
const Point &aCP3)
{
EnsureActive(aCP1);
mSink->AddBezier(D2D1::BezierSegment(D2DPoint(aCP1),
D2DPoint(aCP2),
D2DPoint(aCP3)));
mCurrentPoint = aCP3;
}
void
PathBuilderD2D::QuadraticBezierTo(const Point &aCP1,
const Point &aCP2)
{
EnsureActive(aCP1);
mSink->AddQuadraticBezier(D2D1::QuadraticBezierSegment(D2DPoint(aCP1),
D2DPoint(aCP2)));
mCurrentPoint = aCP2;
}
void
PathBuilderD2D::Close()
{
if (mFigureActive) {
mSink->EndFigure(D2D1_FIGURE_END_CLOSED);
mFigureActive = false;
EnsureActive(mBeginPoint);
}
}
void
PathBuilderD2D::Arc(const Point &aOrigin, Float aRadius, Float aStartAngle,
Float aEndAngle, bool aAntiClockwise)
{
if (aAntiClockwise && aStartAngle < aEndAngle) {
// D2D does things a little differently, and draws the arc by specifying an
// beginning and an end point. This means the circle will be the wrong way
// around if the start angle is smaller than the end angle. It might seem
// tempting to invert aAntiClockwise but that would change the sweeping
// direction of the arc so instead we exchange start/begin.
Float oldStart = aStartAngle;
aStartAngle = aEndAngle;
aEndAngle = oldStart;
}
// XXX - Workaround for now, D2D does not appear to do the desired thing when
// the angle sweeps a complete circle.
bool fullCircle = false;
if (aEndAngle - aStartAngle >= 2 * M_PI) {
fullCircle = true;
aEndAngle = Float(aStartAngle + M_PI * 1.9999);
} else if (aStartAngle - aEndAngle >= 2 * M_PI) {
fullCircle = true;
aStartAngle = Float(aEndAngle + M_PI * 1.9999);
}
Point startPoint;
startPoint.x = aOrigin.x + aRadius * cos(aStartAngle);
startPoint.y = aOrigin.y + aRadius * sin(aStartAngle);
if (!mFigureActive) {
EnsureActive(startPoint);
} else {
mSink->AddLine(D2DPoint(startPoint));
}
Point endPoint;
endPoint.x = aOrigin.x + aRadius * cosf(aEndAngle);
endPoint.y = aOrigin.y + aRadius * sinf(aEndAngle);
D2D1_ARC_SIZE arcSize = D2D1_ARC_SIZE_SMALL;
D2D1_SWEEP_DIRECTION direction =
aAntiClockwise ? D2D1_SWEEP_DIRECTION_COUNTER_CLOCKWISE :
D2D1_SWEEP_DIRECTION_CLOCKWISE;
// if startPoint and endPoint of our circle are too close there are D2D issues
// with drawing the circle as a single arc
const Float kEpsilon = 1e-5f;
if (!fullCircle ||
(std::abs(startPoint.x - endPoint.x) +
std::abs(startPoint.y - endPoint.y) > kEpsilon)) {
if (aAntiClockwise) {
if (aStartAngle - aEndAngle > M_PI) {
arcSize = D2D1_ARC_SIZE_LARGE;
}
} else {
if (aEndAngle - aStartAngle > M_PI) {
arcSize = D2D1_ARC_SIZE_LARGE;
}
}
mSink->AddArc(D2D1::ArcSegment(D2DPoint(endPoint),
D2D1::SizeF(aRadius, aRadius),
0.0f,
direction,
arcSize));
}
else {
// our first workaround attempt didn't work, so instead draw the circle as
// two half-circles
Float midAngle = aEndAngle > aStartAngle ?
Float(aStartAngle + M_PI) : Float(aEndAngle + M_PI);
Point midPoint;
midPoint.x = aOrigin.x + aRadius * cosf(midAngle);
midPoint.y = aOrigin.y + aRadius * sinf(midAngle);
mSink->AddArc(D2D1::ArcSegment(D2DPoint(midPoint),
D2D1::SizeF(aRadius, aRadius),
0.0f,
direction,
arcSize));
// if the adjusted endPoint computed above is used here and endPoint !=
// startPoint then this half of the circle won't render...
mSink->AddArc(D2D1::ArcSegment(D2DPoint(startPoint),
D2D1::SizeF(aRadius, aRadius),
0.0f,
direction,
arcSize));
}
mCurrentPoint = endPoint;
}
Point
PathBuilderD2D::CurrentPoint() const
{
return mCurrentPoint;
}
void
PathBuilderD2D::EnsureActive(const Point &aPoint)
{
if (!mFigureActive) {
mSink->BeginFigure(D2DPoint(aPoint), D2D1_FIGURE_BEGIN_FILLED);
mBeginPoint = aPoint;
mFigureActive = true;
}
}
already_AddRefed<Path>
PathBuilderD2D::Finish()
{
if (mFigureActive) {
mSink->EndFigure(D2D1_FIGURE_END_OPEN);
}
HRESULT hr = mSink->Close();
if (FAILED(hr)) {
gfxDebug() << "Failed to close PathSink. Code: " << hexa(hr);
return nullptr;
}
return MakeAndAddRef<PathD2D>(mGeometry, mFigureActive, mCurrentPoint, mFillRule, mBackendType);
}
already_AddRefed<PathBuilder>
PathD2D::CopyToBuilder(FillRule aFillRule) const
{
return TransformedCopyToBuilder(Matrix(), aFillRule);
}
already_AddRefed<PathBuilder>
PathD2D::TransformedCopyToBuilder(const Matrix &aTransform, FillRule aFillRule) const
{
RefPtr<ID2D1PathGeometry> path;
HRESULT hr = DrawTargetD2D1::factory()->CreatePathGeometry(getter_AddRefs(path));
if (FAILED(hr)) {
gfxWarning() << "Failed to create PathGeometry. Code: " << hexa(hr);
return nullptr;
}
RefPtr<ID2D1GeometrySink> sink;
hr = path->Open(getter_AddRefs(sink));
if (FAILED(hr)) {
gfxWarning() << "Failed to open Geometry for writing. Code: " << hexa(hr);
return nullptr;
}
if (aFillRule == FillRule::FILL_WINDING) {
sink->SetFillMode(D2D1_FILL_MODE_WINDING);
}
if (mEndedActive) {
OpeningGeometrySink wrapSink(sink);
mGeometry->Simplify(D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
D2DMatrix(aTransform),
&wrapSink);
} else {
mGeometry->Simplify(D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
D2DMatrix(aTransform),
sink);
}
RefPtr<PathBuilderD2D> pathBuilder = new PathBuilderD2D(sink, path, aFillRule, mBackendType);
pathBuilder->mCurrentPoint = aTransform * mEndPoint;
if (mEndedActive) {
pathBuilder->mFigureActive = true;
}
return pathBuilder.forget();
}
void
PathD2D::StreamToSink(PathSink *aSink) const
{
HRESULT hr;
StreamingGeometrySink sink(aSink);
hr = mGeometry->Simplify(D2D1_GEOMETRY_SIMPLIFICATION_OPTION_CUBICS_AND_LINES,
D2D1::IdentityMatrix(), &sink);
if (FAILED(hr)) {
gfxWarning() << "Failed to stream D2D path to sink. Code: " << hexa(hr);
return;
}
}
bool
PathD2D::ContainsPoint(const Point &aPoint, const Matrix &aTransform) const
{
BOOL result;
HRESULT hr = mGeometry->FillContainsPoint(D2DPoint(aPoint), D2DMatrix(aTransform), 0.001f, &result);
if (FAILED(hr)) {
// Log
return false;
}
return !!result;
}
bool
PathD2D::StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
const Point &aPoint,
const Matrix &aTransform) const
{
BOOL result;
RefPtr<ID2D1StrokeStyle> strokeStyle = CreateStrokeStyleForOptions(aStrokeOptions);
HRESULT hr = mGeometry->StrokeContainsPoint(D2DPoint(aPoint),
aStrokeOptions.mLineWidth,
strokeStyle,
D2DMatrix(aTransform),
&result);
if (FAILED(hr)) {
// Log
return false;
}
return !!result;
}
Rect
PathD2D::GetBounds(const Matrix &aTransform) const
{
D2D1_RECT_F d2dBounds;
HRESULT hr = mGeometry->GetBounds(D2DMatrix(aTransform), &d2dBounds);
Rect bounds = ToRect(d2dBounds);
if (FAILED(hr) || !bounds.IsFinite()) {
gfxWarning() << "Failed to get stroked bounds for path. Code: " << hexa(hr);
return Rect();
}
return bounds;
}
Rect
PathD2D::GetStrokedBounds(const StrokeOptions &aStrokeOptions,
const Matrix &aTransform) const
{
D2D1_RECT_F d2dBounds;
RefPtr<ID2D1StrokeStyle> strokeStyle = CreateStrokeStyleForOptions(aStrokeOptions);
HRESULT hr =
mGeometry->GetWidenedBounds(aStrokeOptions.mLineWidth, strokeStyle,
D2DMatrix(aTransform), &d2dBounds);
Rect bounds = ToRect(d2dBounds);
if (FAILED(hr) || !bounds.IsFinite()) {
gfxWarning() << "Failed to get stroked bounds for path. Code: " << hexa(hr);
return Rect();
}
return bounds;
}
}
}